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Anna Fontcuberta i Morral

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Publications associées (286)

Efficient Multiterminal Spectrum Splitting via a Nanowire Array Solar Cell

Anna Fontcuberta i Morral, Esther Alarcon Llado

Nanowire-based solar cells opened a new avenue for increasing conversion efficiency and rationalizing material use by growing different III-V materials on silicon substrates. Here, we propose a multiterminal nanowire solar cell design with a theoretical co ...

Amer Chemical Soc2015

High Yield of GaAs Nanowire Arrays on Si Mediated by the Pinning and Contact Angle of Ga

Anna Fontcuberta i Morral, Anna Dalmau Mallorquí, Gözde Tütüncüoglu, Sonia Conesa Boj, Eleonora Russo, Federico Matteini, Jelena Vukajlovic Plestina, Heidi Andrea Potts

GaAs nanowire arrays on Silicon offer great perspectives in the :optoeleetronics and solar cell industry. To fulfill this potential, gold-free growth in predetermined positions should be achieved. Ga-assisted growth of GaAs nano-wires in the form of array ...

American Chemical Society2015

Modulation Doping of GaAs/AlGaAs Core-Shell Nanowires With Effective Defect Passivation and High Electron Mobility

Anna Fontcuberta i Morral, Sonia Conesa Boj, Alberto Casadei, Federico Matteini, Fauzia Jabeen, Francesca Amaduzzi

Reliable doping is required to realize many devices based on semiconductor nanowires. Group IIIV nanowires show great promise as elements of high-speed optoelectronic devices, but for such applications it is important that the electron mobility is not comp ...

American Chemical Society2015

Magnetization reversal of an individual exchange-biased permalloy nanotube

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Dirk Grundler, Federico Matteini

We investigate the magnetization reversal mechanism in an individual permalloy (Py) nanotube (NT) using a hybrid magnetometer consisting of a nanometer-scale SQUID (nanoSQUID) and a cantilever torque sensor. The Py NT is affixed to the tip of a Si cantilev ...

American Physical Society2015

Terahertz spectroscopy of modulation doped core-shell GaAs/AlGaAs nanowires

Anna Fontcuberta i Morral, Daniel Rüffer, Sonia Conesa Boj, Alberto Casadei, Federico Matteini, Francesca Amaduzzi

In order to realize many devices based on semiconductor nanowires, reliable doping is essential. For such devices, it is important that the electron mobility is not compromised by doping incorporation. Here, we show that core-shell GaAs/AlGaAs nanowires ca ...

IEEE2015

Field-effect passivation on silicon nanowire solar cells

Bénédicte Demaurex, Anna Fontcuberta i Morral, Stefaan De Wolf, Anna Dalmau Mallorquí, Amirreza Kiani, Esther Alarcon Llado

Surface recombination represents a handicap for high-efficiency solar cells. This is especially important for nanowire array solar cells, where the surface-to-volume ratio is greatly enhanced. Here, the effect of different passivation materials on the effe ...

Tsinghua Univ Press2015

Bottom-up engineering of InAs at the nanoscale: From V-shaped nanomembranes to nanowires

Anna Fontcuberta i Morral, Anna Dalmau Mallorquí, Gözde Tütüncüoglu, Sonia Conesa Boj, Eleonora Russo, Ignasi Canales Mundet

The ability to rationally tune the morphology of nanostructures is a fundamental milestone in nanoscale engineering. In particular, the possibility to switch between different shapes within the same material system represents a further step in the developm ...

Elsevier2015

Nonstoichiometric Low-Temperature Grown GaAs Nanowires

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Federico Matteini, Heidi Andrea Potts, Tao Xu

The structural and electronic properties of nonstoichiometric low-temperature grown GaAs nanowire shells have been investigated with scanning tunneling microscopy and spectroscopy, pump probe reflectivity, and cathodoluminescence measurements. The growth o ...

American Chemical Society2015

Polymer Brush Guided Formation of Conformal, Plasmonic Nanoparticle-Based Electrodes for Microwire Solar Cells

Harm-Anton Klok, Caroline Sugnaux, Anna Fontcuberta i Morral, Anna Dalmau Mallorquí

This report explores the use of sacrificial thin polymer films prepared by surface-initiated polymerization as a template for the fabrication of highly conformal metal nanoparticle solar cell electrodes. As a first proof-of-principle, the use of this metho ...

Wiley-Blackwell2015

Large-Area Epitaxial Monolayer MoS2

Andras Kis, Aleksandra Radenovic, Anna Fontcuberta i Morral, Philippe Gillet, Nicola Marzari, Simone Bertolazzi, Oriol López Sánchez, Daria Krasnozhon, Ming-Wei Chen, Dmitry Ovchinnikov, Marco Gibertini, Dumitru Dumcenco, Yen-Cheng Kung, Kolyo Marinov

Two-dimensional semiconductors such as MoS2 are an emerging material family with wide-ranging potential applications in electronics, optoelectronics, and energy harvesting. Large-area growth methods are needed to open the way to applications. Control over ...

Amer Chemical Soc2015

Hybrid Semiconductor Nanowire-Metallic Yagi-Uda Antennas

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Alberto Casadei, Federico Matteini, Mohammad Ramezani

We demonstrate the directional emission of individual GaAs nanowires by coupling this emission to Yagi-Uda optical antennas. In particular, we have replaced the resonant metallic feed element of the nanoantenna by an individual nanowire and measured with t ...

American Chemical Society2015

Cracking the Si Shell Growth in Hexagonal GaP-Si Core-Shell Nanowires

Anna Fontcuberta i Morral, Sonia Conesa Boj

Semiconductor nanowires have increased the palette of possible heterostructures thanks to their more effective strain relaxation. Among these core shell heterostructures are much more sensitive to strain than axial Ones. It is now accepted that the formati ...

American Chemical Society2015

Analysis of the Atomic Layer Deposited Al2O3 field-effect passivation in black silicon

Anna Fontcuberta i Morral, Sonia Conesa Boj

We demonstrate that n-type black silicon can be passivated efficiently using Atomic Layer Deposited (ALD) Al2O3, reaching maximum surface recombination velocities below 7 cm/s. We show that the low surface recombination velocity results from a higher sensi ...

Elsevier2015

Modulation of Fluorescence Signals from Biomolecules along Nanowires Due to Interaction of Light with Oriented Nanostructures

Anna Fontcuberta i Morral, Esther Alarcon Llado

High aspect ratio nanostructures have gained increasing interest as highly sensitive platforms for biosensing. Here, well-defined biofunctionalized vertical indium arsenide nanowires are used to map the interaction of light with nanowires depending on thei ...

American Chemical Society2015

Quantum dots in the GaAs/AlxGa1-xAs core-shell nanowires: Statistical occurrence as a function of the shell thickness

Yannik Fontana, Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Léo Duchêne, Sonia Conesa Boj, Federico Matteini, Luca Francaviglia

Quantum dots (QDs) embedded in nanowires represent one of the most promising technologies for applications in quantum photonics. Self-assembled bottom-up fabrication is attractive to overcome the technological challenges involved in a top-down approach, bu ...

American Institute of Physics2015

Tailoring the diameter and density of self-catalyzed GaAs nanowires on silicon

Yannik Fontana, Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Federico Matteini, Vladimir Dubrovskii

Nanowire diameter has a dramatic effect on the absorption cross-section in the optical domain. The maximum absorption is reached for ideal nanowire morphology within a solar cell device. As a consequence, understanding how to tailor the nanowire diameter a ...

Institute of Physics2015

Towards defect-free 1-D GaAs/AlGaAs heterostructures based on GaAs nanomembranes

Anna Fontcuberta i Morral, Gözde Tütüncüoglu, Davide Deiana, Federico Matteini, Heidi Andrea Potts

We demonstrate the growth of defect-free zinc-blende GaAs nanomembranes by molecular beam epitaxy. Our growth studies indicate a strong impact of As-4 re-emission and shadowing in the growth rate of the structures. The highest aspect ratio structures are o ...

Royal Soc Chemistry2015

Polarization response of nanowires a la carte

Anna Fontcuberta i Morral, Martin Heiss, Esther Alarcon Llado, Eleonora Russo, Alberto Casadei, Francesca Amaduzzi

Thanks to their special interaction with light, semiconductor nanowires have opened new avenues in photonics, quantum optics and solar energy harvesting. One of the major challenges for their full technological deployment has been their strong polarization ...

Nature Publishing Group2015

Gold-Free Ternary III-V Antimonide Nanowire Arrays on Silicon: Twin-Free down to the First Bilayer

Anna Fontcuberta i Morral, Sonia Conesa Boj

With the continued maturation of III-V nanowire research, expectations of material quality should be concomitantly raised. Ideally, III-V nanowires integrated on silicon should be entirely free of extended planar defects such as twins, stacking faults, or ...

American Chemical Society2014

Plastic and Elastic Strain Fields in GaAs/Si Core-Shell Nanowires

Christophe Ballif, Anna Fontcuberta i Morral, Martin Heiss, Sylvain Dunand, Sonia Conesa Boj, Eleonora Russo

Thanks to their unique morphology, nanowires have enabled integration of materials in a way that was not possible before with thin film technology. In turn, this opens new avenues for applications in the areas of energy harvesting, electronics, and optoele ...

American Chemical Society2014

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